Li Tianqing cautiously moved towards the interior of the conch shell, only to see that it was quite spacious inside, with the widest part reaching about two zhang and a height exceeding two zhang.
After walking more than ten steps inward, the space began to shrink, and after turning a corner, it was only about one zhang wide. Turning another two bends, the space was just large enough to accommodate one person.
Chen Shi's Taotie Devouring Heaven Technique didn't shrink a person, but in fact, the person or object affected by the technique remained unchanged. What changed was the carrier of the Spell. If the Spell was cast on a basin, the space inside the basin would become immensely vast; if used on one's sleeve, the sleeve would seem like a huge, boundless bag.
Chen Shi had applied this technique to a conch shell; the shell did not grow in size, but its interior space expanded, allowing them to hide.